Kelvin Gastelum flagged by USADA for marijuana, pulled from Anderson Silva fight

Kelvin Gastelum has been pulled from his UFC 212 fight against Anderson Silva after potentially testing positive for marijuana metabolites in an in-competition drug test conducted by USADA, the UFC announced Thursday.
Gastelum, 25, was flagged for a potential anti-doping violation stemming from an in-competition drug test collected in conjunction with his March 11 victory over Vitor Belfort at UFC Fight Night 106, according to a UFC statement. Gastelum was flagged for Carboxy-Tetrahydrocannabino